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Library of Congress Subject Areas (20303)
- A General Works (123)
  - AC Collections. Series. Collected works (38)
  - AI Indexes (General) (39)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (46)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (49)
  - B Philosophy (General) (4)
  - BC Logic (2)
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  - BP Islam. Bahaism. Theosophy, etc (19)
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- C Auxiliary Sciences of History (7)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
  - CC Archaeology (1)
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    - CD921 Archives (1)
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- D History General and Old World (7)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (61)
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- H Social Sciences (6965)
  - H Social Sciences (General) (1531)
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  - HB Economic Theory (541)
  - HC Economics (1847)
  - HD Industries. Land use. Labor (908)
    - HD1401 Agriculture-Economic aspects (104)
    - HD28 Management. Industrial Management (318)
    - HD30.213 Decision Support Systems (18)
    - HD30.27 Business Forecasting (34)
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    - HD30.3 Communication in Organizations (44)
    - HD38.5 Supply Chain Management (72)
    - HD59-59.6 Public relations. Industrial publicity (39)
    - HD61 Risk Management (37)
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  - HE Transportation and Communications (73)
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- J Political Science (1040)
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- K Law (1288)
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- L Education (901)
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    - LC5201 Education extension. Adult education. Continuing education (3)
  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (19)
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- N Fine Arts (1106)
  - N Visual arts (434)
    - N400-3990 Art museums, galleries, etc. (19)
    - N61-72 Theory. Philosophy. Aesthetics of the visual arts (54)
    - N81-390 Study and teaching. Research (56)
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  - NA Architecture (457)
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  - NX Arts in general (156)
- P Language and Literature (456)
  - P Philology. Linguistics (432)
    - P302-302.87 Discourse analysis (5)
    - P87 Communication. Mass Media (348)
    - P94.7 Interpersonal communication (35)
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- Q Science (1572)
  - Q Science (General) (451)
  - QA Mathematics (873)
    - QA76.87 Neural computers (43)
    - QA75 Electronic computers. Computer science (253)
    - QA76 Computer software (195)
    - QA76.6 Computer Programming (440)
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  - QC Physics (37)
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- R Medicine (30)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RE Ophthalmology (1)
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    - RJ101 Child Health. Child health services (1)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (2)
  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (1)
- S Agriculture (1764)
  - S Agriculture (General) (1518)
    - S590-599.9 Soils. Soil science (195)
    - S631-667 Fertilizers and Improvement of the soil (173)
  - SB Plant culture (307)
    - SB599-990.5 Pests and Diseases (81)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (146)
  - SD Forestry (34)
  - SF Animal culture (25)
  - SH Aquaculture. Fisheries. Angling (32)
  - SK Hunting sports (1)
- T Technology (6265)
  - T Technology (General) (2252)
    - T55.4-60.8 Industrial engineering. Management engineering (527)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (139)
    - T58.6-58.62 Management Information Systems (657)
  - TA Engineering (General). Civil engineering (General) (709)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (1014)
  - TE Highway engineering. Roads and pavements (58)
  - TF Railroad engineering and operation (12)
  - TG Bridge engineering (12)
  - TH Building construction (82)
  - TJ Mechanical engineering and machinery (71)
  - TK Electrical engineering. Electronics Nuclear engineering (118)
    - TK5105 Computer Network (48)
    - TK5105.882 Internet (45)
    - TK5105.888 World Wild Web (50)
  - TL Motor vehicles. Aeronautics. Astronautics (4)
  - TN Mining engineering. Metallurgy (9)
  - TP Chemical technology (2052)
    - TP155 Chemical engineering (1531)
    - TP368 Food processing and manufacture (380)
    - TP500 Fermentation industries. Beverages. Alcohol (17)
  - TR Photography (14)
  - TS Manufactures (270)
    - TS 155-194 Production Management, Operations Management (190)
    - TS 180-TS180.8 Material Handling (14)
  - TT Handicrafts Arts and crafts (14)
  - TX Home economics (20)
- U Military Science (9)
  - U Military Science (General) (9)
- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (82)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (45)
  - Z719 Libraries (General) (13)
  - ZA Information resources (29)
    - ZA4050 Electronic information resources (9)
    - ZA4450 Databases (15)